package com.welink.web.common;

import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 拦截器
 * Created by daniel on 15-3-16.
 */
public class CommonInterceptor implements HandlerInterceptor {

    private static org.slf4j.Logger log = LoggerFactory.getLogger(CommonInterceptor.class);

    public CommonInterceptor() {
        // TODO Auto-generated constructor stub
    }

    private String mappingURL;//利用正则映射到需要拦截的路径

    public void setMappingURL(String mappingURL) {
        this.mappingURL = mappingURL;
    }

    /**
     * 在业务处理器处理请求之前被调用
     * 如果返回false
     *     从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
     *
     * 如果返回true
     *    执行下一个拦截器,直到所有的拦截器都执行完毕
     *    再执行被拦截的Controller
     *    然后进入拦截器链,
     *    从最后一个拦截器往回执行所有的postHandle()
     *    接着再从最后一个拦截器往回执行所有的afterCompletion()
     */
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response, Object handler) throws Exception {
        // TODO Auto-generated method stub
        log.info("==============执行顺序: 1、preHandle================");
//        String url=request.getRequestURL().toString();
//        if(mappingURL==null || url.matches(mappingURL)){
//            request.getRequestDispatcher("/msg.jsp").forward(request, response);
//            return false;
//        }
        return true;
    }

    //在业务处理器处理请求执行完成后,生成视图之前执行的动作
    @Override
    public void postHandle(HttpServletRequest request,
                           HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
        // TODO Auto-generated method stub
        log.info("==============执行顺序: 2、postHandle================");
    }

    /**
     * 在DispatcherServlet完全处理完请求后被调用
     *
     *   当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
     */
    @Override
    public void afterCompletion(HttpServletRequest request,
                                HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        // TODO Auto-generated method stub
        log.info("==============执行顺序: 3、afterCompletion================");
    }
}
